The ancient Celts distilled their knowledge and wisdom into what are know as “triads,” pithy three-part sayings. Wolf’s Den has one of the best collections of the triads I have yet come across, with a very good introduction to understanding them and the Celtic way of thought. A few of my personal favorites:

Three candles that illume every darkness: truth, nature, and knowledge.Three false sisters: “perhaps”, “maybe”, and “I dare say”. There are three whose full reward can never be given to them: parents, a good teacher, and the Mighty Ones [Gods].

No study of Druidism would be complete without a thorough study of the triads.